JP2020006136A - Folding chair - Google Patents

Abstract

To provide a compact folding chair which has a simple structure and in which a width directional dimension of front and rear legs is small.SOLUTION: A folding chair 10 is constituted of: a pair of front legs 12; a pair of rear legs 14 rotatably pivoted on the front legs 12; and a seat part 16 rotatable with respect to the front legs 12 and the rear legs 14 between a horizontal state and a flip-up state. The rear legs 14 are arranged inside the front legs 12, and the seat part 16 is rotatably pivoted on a spindle leg by using one of the front leg 12 and the rear leg 14 as the spindle leg. Furthermore, there are provided: a link connection bar 18 constructed between link legs by using, as the link leg, the other of the front leg 12 and the rear leg 14 which is not the spindle leg; a link bar 20 having one end rotatably connected to the link connection bar 18, and the other rotatably connected to the bottom face of the seat part; and a stopper 70 engaged with the link connection bar 18 on the bottom face of the seat part 16 when the seat part 16 is in a horizontal state.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a foldable chair.

  2. Description of the Related Art Conventionally, a large number of folding chairs that can be saved when not in use by folding them down have been developed (for example, Patent Document 1).

  The folding chair disclosed in Patent Literature 1 is provided with a release operation tool on the back of the backrest, and operates the release operation tool to perform a lock release operation by a lock device provided on the bottom surface of the seat. Is available.

JP-A-2006-105911

  However, the folding chair disclosed in Patent Literature 1 has a problem that the mechanism for flipping up the seat at the time of folding is complicated and the width dimension of the front and rear legs is larger than the width dimension of the seat. ,

  The present invention has been made in view of the above-mentioned problem, and an object of the present invention is to provide a compact folding chair having a simple structure and a small width dimension of front and rear legs.

According to one aspect of the invention,
A pair of front legs, a pair of rear legs pivotally supported on the front legs, respectively, and a seat rotatable with respect to the front legs and the rear legs between a horizontal state and a flipped state; And a folding chair comprising:
The rear leg is disposed inside the front leg,
The seat portion is rotatably supported by the support leg using one of the front leg and the rear leg as a support leg.
A link connection bar erected between the link legs with the other of the front legs and the rear legs not being the support leg being a link leg;
A link bar having one end rotatably connected to the link connection bar and the other end rotatably connected to the bottom surface of the seat;
A folding chair is provided, wherein a bottom surface of the seat is provided with a stopper that engages with the link connection bar when the seat is in a horizontal state.

  Preferably, the pivot leg is the rear leg, and the link leg is the front leg.

  Preferably, a position at which the rear leg is pivotally supported with respect to the front leg is ahead of a position at which the seat is pivotally supported with respect to the support leg.

  Preferably, the folding chair further includes a rotation urging member that acts on the bottom surface of the seat to urge the seat upward.

Preferably, an armrest body having one end attached to a frame extending above the seat from the front leg or the rear leg,
Pivotally supporting means for rotatably mounting the armrest body to the frame,
The pivot means can remove the armrest body from the frame without tools.

Preferably, an armrest body having one end attached to a frame extending above the seat from the front leg or the rear leg,
A rotation restricting member for restricting a rotation range of the armrest main body with respect to the frame is further provided.
The rotation restricting member has a receiving portion for directly receiving a force in a direction for rotating the other end portion of the armrest body downward, and a hitting portion for receiving the force in cooperation with the frame.

  Preferably, the armrest body is rotatably attached to the frame, and the armrest body further includes a shaft supporting means for receiving a part of the force.

  According to the present invention, the link bar is rotatably disposed between the bottom surface of the seat rotatably supported by the support leg and the link connection bar provided between the link legs. Since the rear leg is arranged inside the front leg together with the front leg, the folding mechanism can be configured with a simple structure, and the width dimension of the front and rear legs with respect to the width dimension of the seat portion. Can be reduced. As described above, a compact folding chair with a simple structure and small width dimensions of the front and rear legs can be provided.

1 is a perspective view of a folding chair 10 according to an embodiment to which the present invention is applied. 1 is a front view of a folding chair 10 according to an embodiment to which the present invention is applied. FIG. 2 is a rear view of the folding chair 10 according to the embodiment to which the present invention is applied. FIG. 2 is a plan view of the folding chair 10 according to the embodiment to which the present invention is applied (a state where the armrest 24 is expanded (a); a state where the armrest 24 is flipped up (b)). It is a bottom view of the folding chair 10 which concerns on embodiment to which this invention is applied. 1 is a left side view of a folding chair 10 according to an embodiment to which the present invention is applied. It is a perspective view showing the state where folding chair 10 concerning the embodiment to which the present invention was applied was folded. FIG. 2 is an enlarged view centering on a bottom surface of a seat 16 in a state where the folding chair 10 is folded. It is a perspective view in the state where the folding chair 10 concerning the modification 1 was folded. It is a perspective view in the state where the folding chair 10 concerning the modification 1 was developed. It is a perspective view in the state where the folding chair 10 concerning the modification 2 was folded. It is a perspective view in the state where the folding chair 10 concerning the modification 3 was folded. It is the figure expanded centering on the bottom surface of the seat part 16 in the state where the folding chair 10 concerning the modification 4 was folded. It is the figure expanded centering on the bottom surface of the seat part 16 in the state where the folding chair 10 concerning the modification 5 was folded. It is the figure expanded centering | focusing on the bottom surface of the seat part 16 in the state which folded the folding chair 10 concerning the modification 6. It is the figure expanded centering on the bottom surface of the seat part 16 in the state where the folding chair 10 concerning the modification 7 was folded. It is a top view which shows the seat surface shape of the seat part 16 in the folding chair 10 concerning the modification 8. It is a top view which shows the seat surface shape of the seat part 16 in the folding chair 10 concerning the modification 8. It is the figure expanded centering on the bottom surface of the seat part 16 in the state where the folding chair 10 concerning the modification 9 was folded. It is sectional drawing in the state where the folding chair 10 which concerns on the modification 9 was folded. It is the figure expanded centering on the bottom surface of the seat part 16 in the state where the folding chair 10 concerning other embodiments in modification 9 was folded up. It is the figure expanded centering on the bottom surface of the seat part 16 in the state where the folding chair 10 concerning other embodiments in modification 9 was folded up. It is the figure expanded centering on the bottom surface of the seat part 16 in the state where the folding chair 10 concerning other embodiments in modification 9 was folded up. It is the figure expanded centering on the bottom surface of the seat part 16 in the state where the folding chair 10 concerning other embodiments in modification 9 was folded up. It is the figure expanded centering on the bottom surface of the seat part 16 in the state where the folding chair 10 concerning other embodiments in modification 9 was folded up. FIG. 2 is a schematic diagram for describing a structure of an armrest 24. FIG. 3 is a cross-sectional view for describing a structure of an armrest 24. It is a perspective view for explaining the structure about the modification 1 of the armrest 24. It is sectional drawing for demonstrating the structure regarding the modification 1 of the armrest 24. It is a figure for explaining the structure about the modification 2 of the armrest 24. It is a figure for explaining the structure about the modification 3 of the armrest 24. It is a figure for explaining the structure about the modification 3 of the armrest 24. FIG. 14 is a view showing a pivot support means 133 according to a third modification of the armrest 24. FIG. 14 is a view showing a state in which a shaft member 168 is extracted in a third modification of the armrest 24. It is a schematic diagram which shows the positional relationship of the pivot support means 133, the receiving part 146, and the contact part 148. FIG. 36 is a schematic diagram illustrating a positional relationship between the shaft support means 133, the receiving portion 146, and the contact portion 148 when the main body member 144 is not provided in the embodiment illustrated in FIG. It is a schematic diagram which shows the positional relationship of the axial support means 133, the receiving part 146, and the contact part 148 in the positional relationship modification 1. FIG. 13 is a schematic diagram showing a positional relationship between a pivot support means 133, a receiving portion 146, and a contact portion 148 in a case where a main body member 144 is not provided in Modification Example 1 of a positional relationship. It is a schematic diagram which shows the positional relationship of the axial support means 133, the receiving part 146, and the contact part 148 in the positional relationship modification 2. FIG. 14 is a schematic diagram showing a positional relationship between a pivot support means 133, a receiving portion 146, and a contact portion 148 when a main body member 144 is not provided in Modification Example 2 of a positional relationship. It is a schematic diagram which shows the positional relationship of the axial support means 133, the receiving part 146, and the contact part 148 in the positional relationship modification 3. FIG. 14 is a schematic diagram showing a positional relationship among a pivot support means 133, a receiving portion 146, and a contact portion 148 when a main body member 144 is not provided in Modification Example 3 of a positional relationship. It is a schematic diagram which shows the positional relationship of the axial support means 133, the receiving part 146, and the contact part 148 in the positional relationship modification 4. FIG. 14 is a schematic diagram showing a positional relationship among a pivot support means 133, a receiving portion 146, and a contact portion 148 when a main body member 144 is not provided in Modification 4 of a positional relationship. It is a schematic diagram which shows the positional relationship of the axial support means 133, the receiving part 146, and the contact part 148 in the positional relationship modification 5. FIG. 15 is a schematic diagram showing a positional relationship among a pivot support means 133, a receiving portion 146, and a contact portion 148 when a main body member 144 is not provided in Modification Example 5 of the positional relationship. It is a schematic diagram which shows the positional relationship of the axial support means 133, the receiving part 146, and the contact part 148 in the positional relationship modification 6. FIG. 16 is a schematic diagram showing a positional relationship among a pivot support means 133, a receiving portion 146, and a contact portion 148 when a main body member 144 is not provided in Modification 6 of the positional relationship. It is a schematic diagram which shows the positional relationship of the axial support means 133, the receiving part 146, and the contact part 148 in the positional relationship modification 7. It is a schematic diagram which shows the positional relationship of the axial support means 133, the receiving part 146, and the contact part 148 in the case where the main body member 144 is not provided in the positional relationship modification 7. It is a schematic diagram which shows the positional relationship of the axial support means 133, the receiving part 146, and the contact part 148 in the positional relationship modification 8. It is a schematic diagram which shows the positional relationship of the axial support means 133, the receiving part 146, and the contact part 148 in the case of not providing the main body member 144 in the positional relationship modification 8. It is a schematic diagram which shows the positional relationship of the axial support means 133, the receiving part 146, and the contact part 148 in the positional relationship modification 9. It is a schematic diagram which shows the positional relationship of the pivot support means 133, the receiving part 146, and the contact part 148 in the case of not providing the main body member 144 in the positional relationship modification example 9.

(About the configuration of the folding chair 10)
The configuration of the folding chair 10 (hereinafter, simply referred to as “chair 10”) according to the present embodiment will be described with reference to FIGS. 1 to 7. The chair 10 according to the present embodiment generally includes a pair of front legs 12, a pair of rear legs 14, a seat 16, a link connection bar 18, a link bar 20, a backrest 22, and an armrest 24. I have. Note that the backrest 22 and the armrest 24 are not essential components of the present invention and need not be provided.

  Throughout this specification, the direction in which the user sitting on the chair 10 faces is referred to as “forward”, and the opposite direction is referred to as “backward”.

  The front leg 12 is a member formed by bending a pipe material having a circular cross section. In the present embodiment, the front leg 12 includes a backrest support portion 26 extending from the rear to the front and slightly downward from the front in a state where the chair 10 is deployed (that is, the state illustrated in FIGS. 1 to 6). A horizontal portion 28 extending horizontally in the following direction, and a front leg portion 30 extending downward in the forward direction again following the horizontal portion 28 are integrally formed. Further, a leg rubber 32 is attached to a lower end of the front leg 30.

  The pair of front legs 12 are connected to each other by a backrest mounting portion 34 in which the upper ends of the respective backrest support portions 26 extend horizontally. That is, the pair of front legs 12 in the present embodiment is formed by bending one pipe member. Of course, a pair of front legs 12 may be configured by combining a plurality of pipe members.

  In addition, the lower end of the front leg 12 in the present embodiment has a double pipe structure, and a plurality of height adjustment holes 38 are formed at predetermined intervals on the surface of the outer pipe 36. Is provided with a height adjustment pin 42 that can be freely protruded and retracted from the surface of the inner pipe 40 and that is fitted into one of the height adjustment holes 38. Thus, the height from the floor to the seat 16 can be adjusted by adjusting the length of the front leg 30 of the front leg 12.

  The rear leg 14, like the front leg 12, is a member formed by bending a pipe material having a circular cross section. In the present embodiment, the rear leg 14 includes a seat support portion 44 extending slightly rearward and downward from the horizontal direction from the front to the rear in a state where the chair 10 is deployed, and a rear support portion 44 that subsequently extends rearward and downward. It is integrally formed with the leg 46. A leg rubber 48 is also attached to a lower end of the rear leg 46. In the present embodiment, one rear leg 14 is formed of a different pipe material.

  Also, like the front leg 12, the lower end of the rear leg 14 also has a double pipe structure, and a plurality of height adjusting holes 52 are formed on the surface of the outer pipe 50 at predetermined intervals. A height adjustment pin 56 is provided from the top of the inner pipe 54 so as to be freely protruded from the surface of the inner pipe 54 and fitted into one of the height adjustment holes 52.

  In the present embodiment, the rear leg 14 is disposed inside the front leg 12. The pair of front legs 12 and the pair of rear legs 14 are rotatably supported by the center of the horizontal portion 28 of the front leg 12 and the tip of the seat support 44 of the rear leg 14, respectively. I have. Specifically, a front leg side shaft support hole 58 is formed at the center of the horizontal portion 28 of the front leg 12, and a rear leg side shaft support hole 60 is formed at the tip of the seat support portion 44 of the rear leg 14. The front legs 12 and the rear legs 14 are rotatable with each other by inserting the pivot pins 62 through these. As shown in FIG. 6, the pivot positions of the front legs 12 and the rear legs 14 in the present embodiment (that is, positions where the front leg side pivot holes 58 and the like are formed) are the front end of the front legs 12 and the rear end. It is at an intermediate position between the rear ends of the legs 14. In addition, the position of the front leg-side shaft support hole 58 that supports the rear leg 14 to the front leg 12 is not limited to the center of the horizontal portion 28 in the front leg 12 as described above. The front leg side shaft support hole 58 may be provided at a position close to the front leg portion 30.

  Further, in the present embodiment, a seat shaft support pin 64 that supports the seat 16 with the rear leg 14 is fitted slightly behind the rear leg shaft support hole 60 in the seat support portion 44 of the rear leg 14. A seat shaft support hole 66 to be inserted is formed. That is, the pair of rear legs 14 in the present embodiment are “support shaft legs” that rotatably support the seat portion 16. The position at which the rear leg 14 is pivotally supported with respect to the front leg 12 (for example, the position of the rear leg side shaft support hole 60) is determined by the fact that the seat 16 is Position (that is, the seat shaft support hole 66).

  Further, in the present embodiment, a front leg supporting portion 63 that supports the horizontal portion 28 of the front leg 12 from below when the chair 10 is deployed is provided at the position of the seat shaft support hole 66 in the seat supporting portion 44 of the rear leg 14. It protrudes outward. The front leg support portion 63 projects a part of the above-described seat portion pivot pin 64 outward from the rear leg 14, and inserts the seat portion pivot pin 64 into the center of the pipe-shaped front leg support member 65. It is constituted by.

  The seat 16 is a member having a seat surface on which a user sits, and is rotatable with respect to the front legs 12 and the rear legs 14 between a horizontal state and a flipped state. More specifically, as described above, the seat portion 16 is rotatably supported by the seat portion support pin 64 between the pair of rear legs 14, which are support legs. For this reason, a seat shaft support pin hole 68 for receiving the seat shaft support pin 64 is formed in each of the rear side surfaces of the seat 16 in the present embodiment. Further, in the present embodiment, the seat surface shape of the seat portion 16 is such that the width of the front portion is relatively wide, and conversely, the width of the rear portion is relatively narrow (see FIG. 4B).

  As shown in FIG. 8, a stopper 70 that engages with the link connection bar 18 when the chair 10 is unfolded and the seat 16 is in a horizontal state is provided at the front center of the bottom surface of the seat 16. Have been. The stopper 70 in the present embodiment has a lower end formed with an engagement claw 72 that is swingably attached to the bottom surface of the seat 16, and the engagement claw 72 engages with the link connection bar 18. By doing so, the seat 16 can be maintained in a horizontal state.

  Further, a pair of front and rear portions of the bottom surface of the seat portion 16 that support the front portion of the seat portion 16 with the link connection bar 18 by contacting the link connection bar 18 when the seat portion 16 is in a horizontal state. The support projection 74 is formed with a fitting groove 76 in which the link connection bar 18 is fitted.

  In addition, a pair of brackets 78 is provided on the bottom surface of the seat 16 slightly ahead of the position where the seat shaft support pin hole 68 at the rear end is formed. The bracket 78 is composed of a pair of bracket plate members 80 facing each other in parallel with each other. The pair of bracket plate members 80 are arranged with an interval such that the other end of the link bar 20 fits. Further, each bracket plate 80 is formed with a shaft mounting pin insertion hole 81 into which a shaft mounting pin 79 for mounting the other end of the link bar 20 to the bracket 78 is fitted.

  The position at which the pair of brackets 78 are provided is not limited to a position forward of the position where the seat shaft support pin hole 68 at the rear end on the bottom surface of the seat 16 as described above is formed. It may be behind the position where the shaft support pin hole 68 is formed.

  Further, the seat 16 in the present embodiment is configured by stacking a seat surface member formed of a relatively soft material on a seat bottom member formed of a relatively hard material. Of course, the seat 16 may be formed of one type of material, or the seat 16 may be formed of three or more types of materials.

  The link connection bar 18 is a member formed by bending a solid bar having a circular cross section. One end of the link connection bar 18 is connected to the inner surface of a portion where the horizontal portion 28 and the front leg 30 of one of the front legs 12 are connected to each other. The other end is connected to the inner surface of the portion of the other front leg 12 where the horizontal portion 28 and the front leg 30 are connected to each other. Further, the link connection bar 18 in the present embodiment includes an end portion 82 extending substantially inward from both ends thereof, respectively, and a central portion 84 extending substantially horizontally below and slightly below the end portion 82 at the center portion. And are integrally configured.

  The engagement claws 72 of the stopper 70 in the above-described seat 16 engage with the central portion 84 of the link connection bar 18. The end 82 of the link connection bar 18 is fitted into the fitting groove 76 of the support projection 74 in the seat 16.

  As described above, the pair of front legs 12 in the present embodiment are “link legs” in which the link connection bar 18 is installed between them.

  The link bar 20 has one end rotatably connected to the link connection bar 18 (more precisely, the end 82 of the link connection bar 18), and the other end rotated relative to the bottom surface of the seat 16. It is a member that is movably connected.

  8, in the present embodiment, one end of the link bar 20 includes a link bar main body member 86 and a link connection bar holding member 88, and the link bar main body member 86 and the link connection bar holding member 88 are provided. Recesses 90 and 92 into which the link connection bar 18 is fitted are formed in the surfaces facing each other at 88. One end of the link bar 20 is connected to the link connecting bar 18 by joining the link bar main body member 86 and the link connecting bar holding member 88 with screws 94 or the like so that the link connecting bar 18 is sandwiched between the recesses 90 and 92. Is rotatably connected to the

  The other end of the link bar 20 is provided with a shaft mounting pin insertion hole 96 for mounting the other end of the link bar 20 on a bracket 78 formed on the bottom surface of the seat 16. The other end of the link bar 20 is attached to the bottom surface of the seat 16 by inserting the pivot pin 79 into the pivot pin insertion hole 81 formed in the bracket 78 and the pivot pin insertion hole 96. It is rotatably connected.

  In the present embodiment, the reinforcing bar 21 is provided between the pair of rear legs 14, which are "supporting legs," but the reinforcing bar 21 is not an essential component of the present invention.

  Referring back to FIGS. 1 to 7, the backrest 22 is a member for supporting the back of the user sitting on the seat 16 from behind, and as described above, connects the upper ends of the pair of front legs 12 to each other. It is attached to the attachment part 34. Of course, the backrest 22 may be attached to, for example, the backrest support portion 26 of the pair of front legs 12, or may be attached to another member.

  The armrest 24 is a member for a user sitting on the seat 16 to rest his arm. In the present embodiment, the pair of armrests 24 is attached so as to protrude forward from the center of the backrest attachment portion 34 of the pair of front legs 12. In addition, the armrest attachment portion 98 that is an attachment portion to the front leg 12 in each armrest 24 is configured so that the tip of the armrest 24 can rotate with respect to the front leg 12, and the chair 10 is deployed. In this state, the rotation is stopped at a position where the armrest 24 is substantially horizontal. Of course, the armrest 24 may be attached to another member.

(Folding procedure of folding chair 10)
According to the folding chair 10 of the above-described embodiment, it can be folded in the following procedure from the unfolded state (the state shown in FIGS. 1 to 6). That is, the stopper 70 provided on the bottom surface of the seat 16 is swung, and the engaging claw 72 formed at the lower end of the stopper 70 is detached from the link connection bar 18. Thereafter, the front end of the seat 16 is lifted (bounced up) about the seat pivot pin 64 inserted into the side surface of the rear end of the seat 16.

  Then, the seat 16 rotates with respect to the pair of rear legs 14 around the seat shaft support pin 64, and the link connection is performed by the link bar 20 connected to the bracket 78 provided on the bottom surface of the seat 16. The pair of front legs 12 is rotated via the bar 18 in a direction approaching the rear legs 14. As a result, the chair 10 is folded as shown in FIG. 7 with the seat portion 16 completely lifted. In the present embodiment, the pair of armrests 24 are not linked to the above-described folding operation by lifting the seat 16, and the user separately jumps up the armrests 24 with respect to the front legs 12. .

  In order to return from the folded state shown in FIG. 7 to the unfolded state shown in FIGS. 1 to 6, a procedure reverse to the above-described procedure may be performed.

(Features of folding chair 10)
According to the chair 10 according to the present embodiment, the link connection bar erected between the bottom surface of the seat 16 pivotally supported by the rear leg 14 as a pivot leg and the front leg 12 as a link leg. Since the link bar 20 is rotatably disposed between the front leg 12 and the rear bar 14, the rear leg 14 is disposed inside the front leg 12 together with the link bar 20, so that the folding mechanism can be configured with a simple structure. The width of the front leg 12 and the rear leg 14 can be made smaller than the width of the seat 16. As described above, it is possible to provide the compact folding chair 10 having a simple structure and a small width dimension of the front leg 12 and the rear leg 14.

(Modification 1)
In the above-described embodiment, a case has been described in which the “supporting leg” that rotatably supports the seat 16 is the rear leg 14 and the “link leg” on which the link connection bar 18 is installed is the front leg 12. However, this may be replaced. That is, as shown in FIGS. 9 and 10, the seat portion 16 is configured to rotate around the front leg side shaft support hole 100 formed in the horizontal portion 28 of the front leg 12 by the shaft support pin 62, The front leg 12 is a “supporting shaft leg” that rotatably supports the seat portion 16. Further, each end of the link connection bar 18 is connected to the side surface of the rear end of the seat support portion 44 in each rear leg 14, and the rear leg 14 serves as a “link leg” on which the link connection bar 18 is installed. I have.

  In the case of Modification 1, the seat support bar 102, which has a role of supporting the front end of the bottom surface of the seat 16 in the unfolded state, is connected to the connecting position between the horizontal portion 28 and the front leg 30 of the pair of front legs 12. It is erected between them.

  Further, the stopper 70 provided on the bottom surface of the seat portion 16 may be provided at the front end of the bottom surface of the seat portion 16 and engage with the seat portion support bar 102 as in the above-described embodiment. 9 and 10, the seat 16 may be provided at the rear end on the bottom surface of the seat 16 to engage with the link connection bar 18.

(Modification 2)
In the above-described embodiment, the chair 10 is folded by rotating the seat 16 so that the front end of the seat 16 is pulled up. However, as shown in FIG. The seat 16 may be rotated so that the rear end of the portion 16 is pulled up. In this case, when the chair 10 is deployed, the position at which the rear leg 14 is pivotally supported with respect to the front leg 12 (for example, the position of the rear leg side pivot hole 60) is opposite to the above-described embodiment. The position is behind the position where the seat 16 is pivotally supported with respect to the leg (that is, the rear leg 14) (that is, the seat shaft support hole 66).

(Modification 3)
Further, as shown in FIG. 12, the front leg 12 is used as a "supporting leg", the rear leg 14 is used as a "link leg", and the chair 10 is folded by raising the rear end of the seat 16 upward. Is also good.

(Modification 4)
In the above-described embodiment, the other end of the link bar 20 is fitted between a pair of bracket plate members 80 constituting the bracket 78 as shown in FIG. As shown in the figure, a shaft mounting pin insertion hole 81 into which a shaft mounting pin 79 is inserted is provided on a side portion at a rear end portion of the seat portion 16, and the other end of the link bar 20 may be mounted on the side. .

(Modification 5)
As shown in FIG. 14, a protrusion 104 extending in the width direction of the chair 10 from the rear end of the bottom surface of the seat 16 is formed. By forming the hole 81, the other end of the link bar 20 may be pivotally mounted here.

(Modification 6)
Further, as shown in FIG. 15, two projecting portions 106 are formed from the rear end of the bottom surface of the seat portion 16, and each of the projecting portions 106 is formed with a shaft-fitting pin insertion hole 81. The other end of the link bar 20 may be pivotally mounted on the outer end surface of the portion 106.

(Modification 7)
As shown in FIG. 16, two protruding portions 106 are formed from the rear end of the bottom surface of the seat portion 16, and each of the protruding portions 106 is formed with a shaft mounting pin insertion hole 81. The other end of the link bar 20 may be pivotally mounted on the inner end surface of the portion 106.

  As described in Modifications 4 to 7, the manner of connection between the bottom surface of the seat portion 16 and the other end of the link bar 20 is not limited to a particular manner. For example, the position where the other end of the link bar 20 is pivotally mounted (that is, the position of the shaft mounting pin insertion hole 81) is more than the position where the seat 16 is pivotally supported with respect to the rear leg 14). It is located near the link connection bar 18.

(Modification 8)
The seat surface of the seat 16 in the above-described embodiment has a shape in which the width of the front portion is relatively wide and the width of the rear portion is relatively narrow as shown in FIG. The shape of the seat 16 is not limited to this. For example, as shown in FIG. 17, the width of the front part may be relatively narrow, and the width of the rear part may be relatively wide. As shown in FIG. 18, the width of the front part and the width of the rear part may be set in the same manner.

(Modification 9)
Further, as shown in FIG. 19, a rotation urging member 110 that acts on the bottom surface of the seat 16 and urges the seat 16 upward may be provided. In the embodiment shown in FIG. 19, a torsion spring is used as the rotation urging member 110. This torsion spring is a so-called “double” torsion spring, and a “single” torsion spring having the coil portion 112, the first arm portion 114, and the second arm portion 116 is integrally formed as a pair. It forms and constitutes the rotation urging member 110 of the present embodiment. More specifically, the distal ends of the first arms 114 are bent at substantially right angles, and then the distal ends of the first arms 114 are connected to each other.

  Further, the length of a shaft mounting pin 79 for mounting the other end of the link bar 20 to a bracket 78 formed on the bottom surface of the seat 16 is set to be longer than the width of the bracket 78. Both ends of the shaft mounting pin 79 protruding from the bracket 78 are fitted and positioned in both coil portions 112. Further, the end portions (portions bent at a substantially right angle) of both the first arm portions 114 described above come into contact with the surface of the link bar 20. As shown in FIG. 20, the tip of the second arm 116 is also bent at a substantially right angle, and the bent tip is inserted into a fixing hole 120 formed on the bottom surface of the seat 16. I have.

  As a result, the rotation urging member 110, which is a “double” torsion spring, acts on the bottom surface of the seat portion 16 to rotationally urge the bottom surface of the seat portion 16 upward with respect to the link bar 20. The folding chair 10 can be folded by lifting the seat portion 16 with a small force, and the folded state can be prevented from undesirably turning the seat portion 16 downward, thereby maintaining the folded state. Can be.

  In the embodiment shown in FIG. 19, the rotation urging member 110 which is a “double” torsion spring is attached to both link bars 20. Of course, as shown in FIG. The rotation urging member 110 may be attached to only 20.

  Further, as shown in FIG. 22, a “single” torsion spring may be used as the rotation urging member 110.

  Further, as shown in FIG. 23, a so-called push spring may be used as the rotation urging member 110. In this case, one end of the pressing spring (rotation biasing member 110) is in contact with the bottom surface of the seat 16, and the other end is in contact with the surface of the link bar 20. Of course, in this case, an elastomer such as rubber having a predetermined elastic force can be used instead of the pressing spring.

  Further, as shown in FIG. 24, a leaf spring obtained by bending a strip-shaped member may be used as the rotation urging member 110. In this case, the leaf spring (rotation biasing member 110) is disposed such that one end thereof contacts the bottom surface of the seat 16 and the other end contacts the surface of the link bar 20. You.

  Further, a mode as shown in FIG. 25 is also included in the “rotational urging member 110 that acts on the bottom surface of the seat 16 to rotationally urge the seat 16 upward”. In this embodiment, a “single” torsion spring is used as the rotation urging member 110. The tip of a pivot pin 62 for rotatably attaching the front leg 12 and the rear leg 14 to each other protrudes toward the inside of the folding chair 10, and this protruding tip fits into the coil portion 112 of the torsion spring. Has been inserted. In addition, an arm locking pin 122 projects from the side surface of the horizontal portion 28 of each front leg 12 toward the inside. Further, the first arm 114 of the torsion spring (rotation biasing member 110) is locked by the arm locking pin 122, and the second arm 116 is in contact with the bottom of the seat 16. As a result, the torsion spring (rotation biasing member 110) acts on the bottom surface of the seat 16 and can rotate and bias the seat 16 upward.

(About armrest 24)
Next, the armrest 24 attached to the folding chair 10 according to the present invention will be described in detail. As described above, the armrest 24 has the armrest attachment portion 98, and the tip of the armrest 24 is rotatable with respect to the frame 130 extending above the seat 16 of the front leg 12. Further, the armrest 24 is not an essential component of the present invention, and need not be provided on the folding chair 10, that is, it can be freely or freely attached.

  As shown in FIGS. 26 and 27, the armrest 24 generally has an armrest main body 132, a shaft support means 133, and a rotation restricting means 134. In addition, the above-mentioned armrest mounting portion 98 is configured by the shaft support means 133 and the rotation restricting means 134.

  The armrest main body 132 is a substantially straight bar-shaped member, and one end provided with the armrest attachment portion 98 is attached to the frame 130 of the front leg 12. Since the armrest body 132 is a member directly touched by the user, it is preferable to cover the surface of the armrest body 132 with a soft material such as urethane or resin.

  At one end of the armrest main body 132, a pair of left and right attachment portions 138 which are separated from each other and opposed to each other are formed (FIG. 27), and the frame 130 is fitted between these attachment portions 138.

  Further, a receiving rod 147 is provided between the pair of mounting portions 138 of the armrest main body 132. When the armrest main body 132 is pivoted downward to the deployed position where the user can use the armrest body 132, the receiving rod 147 is at a position lower than the shaft support means 133 and at the front of the frame 130. On the side, it is disposed at a position where it contacts the main body member 144.

  The pivot support means 133 is a means for rotatably attaching the armrest main body 132 to the frame 130 of the front leg 12, and may be, for example, a bolt and nut with a hexagonal hole. In the present embodiment, a pair of mounting portions 138 of the armrest main body 132 are each formed with a shaft support means insertion hole 140, and the main body member 144 is also formed with a shaft support means insertion second hole 141. A shaft support means insertion hole 142 is also formed in the frame 130 of the front leg 12. The shaft support means 133 includes one shaft support means insertion hole 140, a second shaft support means insertion hole 141, a shaft support means insertion hole 142, and the other shaft support means insertion second hole 141, and the shaft support means insertion hole 140 in this order. By being inserted, the armrest body 132 is rotatably attached to the frame 130.

  In the case of the present embodiment, the rotation restricting means 134 has a substantially cylindrical main body member 144, a receiving portion 146, and a contact portion 148.

  The main body member 144 is a member that covers a portion of the frame 130 to which the armrest main body 132 is attached. The main body member 144 according to the present embodiment has a half-split structure, and includes a pair of main body member pieces 145. By combining the main body member pieces 145 with the frame 130 interposed therebetween, the main body member 144 covering the frame 130 is completed. After the main body member 144 is mounted, the frame 130 is fitted together with the main body member 144 between the pair of mounting portions 138 of the armrest main body 132.

  The receiving portion 146 is a portion that directly receives a force applied in a direction of rotating the other end portion (tip portion) of the armrest main body 132 further downward when the armrest main body 132 is in the deployed state. In the present embodiment, a portion of the main body member 144 that is in contact with the above-described receiving rod 147 corresponds to the receiving portion 146.

  The contact portion 148 is a portion where the main body member 144 theoretically rotates around the pivot support means 133 as a fulcrum by the force applied to the above-described receiving portion 146 and pushes the frame 130 from the outside. In the present embodiment, the end of the main body member 144 above the shaft support means 133 and on the back side of the frame 130 is the contact portion 148.

  In this embodiment, a cover 150 is attached to the outer surface of the armrest main body 132 at a position corresponding to the attachment portion 138 so that the shaft support means 133 and the receiving rod 147 are not directly visible from the outside. Note that the cover 150 is not an essential component of the present invention.

  The armrest 24 according to the present embodiment is pivotally supported by the frame 130 of the front leg 12 by the pivoting means 133, and is received when the armrest main body 132 is rotated downward to a deployment position where the user can use it. The rod 147 presses the receiving portion 146 of the main body member 114, and the frame 130 receives a part of this force via the shaft supporting means 133, and the contact portion 148 of the main body member 114 comes into contact with the frame 130, and the remaining force is applied. Therefore, the armrest body 132 can be rotated with respect to the frame 130 from the deployment position where the user can use the storage position to stand substantially vertically, and the user can move the distal end of the armrest body 132 in the deployment position. The armrest main body 132 can maintain its deployed position even if a stress is applied that causes the armrest to further pivot downward.

  Further, since the main body member 144 is attached so as to cover the frame 130, and the receiving rod 147 is erected between the attachment portions 138 formed on the armrest main body 132, after the shaft support means 133 is pulled out, When the armrest main body 132 and the main body member 144 are detached from the frame 130, only the shaft support means insertion hole 142 remains in the frame 130, and no projections or the like remain undesirably. Therefore, the folding chair 10 without the armrest 24 can be used without discomfort in a state where the entire armrest 24 is removed.

(Modification 1 of armrest 24)
In the above-described embodiment, a hexagon socket head bolt is used as the shaft support means 133. Alternatively, as shown in FIGS. 28 and 29, a knurled bolt may be used. By using the bolts with knurls as the bearing means 133 in this way, when the armrest 24 is unnecessary, for example, when the user is in a low-care state, the armrest body 133 is removed without using a tool. By removing the 132 from the frame 130 and then removing the body member 144 from the frame 130, the entire armrest 24 can be removed.

(Modification 2 of armrest 24)
As another example of the shaft support means 133 which can be removed without using a tool, as shown in FIG. 30, the shaft support means 133 is constituted by a pair of disc-shaped members 160 and a round bar-shaped shaft member 162. May be.

  One end of the shaft member 162 is connected to a center position on the inner surface of one disk-shaped member 160, and the other end is formed with a male screw. A female screw into which the male screw is screwed is formed at a center position on the inner surface of the other disk-shaped member 160. In addition, a knob 164 that is gripped by a user when turning the disk-shaped member 160 is formed on the outer surface of each disk-shaped member 160 so as to protrude.

  Thus, when attaching the armrest 24 to the frame 130, the tip of the shaft member 162 is inserted into the shaft support means insertion hole 140 or the like, and the knob 164 is turned to engage with the female screw formed on the other disc-shaped member 160. Screw together. Conversely, when removing the armrest 24 from the frame 130, the knob 164 is turned to separate the two disc-shaped members 160 from each other, and the shaft member 162 is pulled out from the shaft support means insertion hole 140 or the like, thereby removing the entire armrest 24. be able to.

(Modification 3 of armrest 24)
Further, as another example of the shaft support means 133 which can be removed without using a tool, as shown in FIGS. 31 to 34, the shaft support means 133 is formed by a disc-shaped member 166, a shaft member 168, and a shaft presser. The member 172 and the shaft pressing member urging member 174 may be configured.

  The disc-shaped member 166 is formed with a shaft member insertion hole 176 into which the shaft member 168 is slidably inserted (FIG. 33). Further, the shaft pressing member 172 is rotatably attached to the surface of the disc-shaped member 166, and the shaft pressing member biasing member 174 is placed at a position where the shaft pressing member 172 urges in the direction of pressing the tip of the shaft member 168. Are arranged. Further, the tip of the shaft member 168 is rotatably attached to the shaft holding member 172.

  Accordingly, in a natural state, the shaft pressing member 172 urged by the shaft pressing member urging member 174 presses the tip of the shaft member 168, whereby the shaft member 168 is pushed into the shaft member insertion hole 176. Since the disk-shaped member 166 itself is fixed to the armrest main body 132, the opposite end of the shaft member 168 enters the shaft support means insertion hole 142 in a state where the shaft member 168 is pushed in this way. I have.

  As described above, since the shaft member 168 is inserted into the shaft support means insertion hole 142 from both sides of the frame 130, the armrest main body 132 is mounted on the frame 130.

  Conversely, when removing the armrest 24 from the frame 130, the shaft holding member 172 is tilted in the opposite direction against the urging force of the shaft pressing member urging member 174 (FIG. 34), so that the shaft member 168 is pivotally supported. It is withdrawn from the means insertion hole 142. Thus, the entire armrest 24 can be removed without using a tool. ｀

(Modified example regarding the positional relationship between the shaft support means 133, the receiving part 146, and the contact part 148)
In the above-described embodiment, as shown in FIG. 35, the positional relationship between the shaft support means 133, the receiving portion 146, and the contact portion 148 is such that the shaft support means 133 penetrates the frame 130, and The position is lower than the position of the pivot support means 133, and is on the front side of the frame 130 (the side facing the user when sitting on the seat 16; the same applies hereinafter), and the position of the contact portion 148. Is higher than the position of the shaft support means 133 and on the back side of the frame 130 (the side opposite to the above-described front side; the same applies hereinafter).

  When the main body member 144 is not provided, the receiving rod 147 is provided between the pair of mounting portions 138 of the armrest main body 132 as shown in FIG. More specifically, in the deployed position of the armrest 24, the position of the receiving rod 147 is set lower than the shaft support means 133 and is set to abut on the front side of the frame 130. Accordingly, when the user applies a stress for rotating the distal end portion of the armrest main body 132 further downward, the receiving rod 147 comes into contact with the receiving portion 146 that is in contact with the frame 130, and the same position of the frame 130. At the contact point 148 receives the stress.

  By the way, the armrest main body 132 can be rotated with respect to the frame 130 from a deployment position which can be used by the user to a storage position where the user stands substantially vertically. The armrest main body 132 can maintain the deployed position even when a stress for rotating the armrest downward is applied, as shown in FIGS. 35 and 36. Also, this is true even if the positional relationship of the hit portion 148 is changed.

  Therefore, hereinafter, a modified example (hereinafter, simply referred to as a “positional relationship modified example”) relating to the positional relationship between the bearing 133, the receiving portion 146, and the contact portion 148 will be described.

(Position relation modification example 1)
As shown in FIG. 37, the positional relationship between the bearing 133, the receiving part 146, and the contact part 148 is set at a position penetrating the frame 130, and the receiving part 146 and the contact part 148 are set. May be set higher than the position of the shaft support means 133, which is basically the same as each other, and on the back side of the frame 130.

  In this case, the receiving rod 147 attached to the armrest main body 132 is also higher than the position of the pivot support means 133 and is disposed on the back side of the frame 130 when the armrest main body 132 is in the deployed position. Accordingly, when the user applies a stress that causes the distal end portion of the armrest main body 132 to rotate further downward, the receiving rod 147 comes into contact with the receiving portion 146 of the main body member 144, and the hitting portion which is basically at the same position. 148 contacts frame 130 to receive the stress.

  When the main body member 144 is not provided, as shown in FIG. 38, the receiving rod 147 provided between the pair of mounting portions 138 of the armrest main body 132 causes the support means 133 to move when the armrest main body 132 is in the deployed position. Higher than that of the frame 130 and contact the rear side of the frame 130. Accordingly, when the user applies a stress for rotating the distal end portion of the armrest main body 132 further downward, the receiving rod 147 comes into contact with the receiving portion 146 that is in contact with the frame 130, and the same position of the frame 130. At the contact point 148 receives the stress.

(Position relation modification 2)
As shown in FIG. 39, the positional relationship between the bearing 133, the receiving part 146, and the contact part 148 according to the present modification is set at a position penetrating the frame 130, and the receiving part 146 is set. The position of the contact portion 148 is set lower than the position of the shaft support 133 and on the front side of the frame 130, and the position of the hit portion 148 is lower than the position of the shaft support 133 and lower than the position of the receiving portion 146. High, and may be set at a position overlapping the frame 130.

  In this case, a projection 180 is protruded from a position corresponding to the hitting portion 148 on the surface of the frame 130, and the receiving portion 146 of the main body member 144 is inverted by a receiving rod 147 as shown in the drawing. The main body member 144 is formed with a projection contact portion 182 that contacts the projection 180 from the left side in the drawing so as to receive the pressing force because the pressure is pressed clockwise. The shape of the protrusion contact portion 182 is not limited to a linear shape as shown in the figure. For example, when a hole is formed in the main body member 144 so that the protrusion 180 fits, the left circular arc portion of the hole is formed. Corresponds to the protrusion contact portion 182.

  Thus, when the user applies a stress for rotating the distal end portion of the armrest main body 132 further downward, the receiving rod 147 comes into contact with the receiving portion 146 of the main body member 144 and the support member 133 is centered in the drawing. Although it is going to rotate counterclockwise, the contact portion 148 of the projection contact portion 182 contacts the projection 180 formed on the frame 130 to receive the stress.

  When the main body member 144 is not provided, as shown in FIG. 40, the receiving rod 147 provided between the pair of mounting portions 138 of the armrest main body 132 can be used as the support means 133 when the armrest main body 132 is in the deployed position. And is set to be in contact with the front side of the frame 130. In addition, a projection 180 is protruded from a position lower than the position of the shaft support means 133 and higher than the position of the receiving portion 146 in the frame 130, and, for example, as shown in FIG. Is formed with a projection contact portion 182 that contacts the projection 180 from the right side in the figure. The position where the protrusion 180 and the protrusion contact portion 182 contact each other is a contact portion 148.

  Thus, when the user applies a stress that causes the distal end portion of the armrest main body 132 to rotate further downward, the receiving rod 147 comes into contact with the receiving portion 146 of the frame 130 and the protrusion 180 formed on the frame 130. The contact portion 148 is contacted with the projection contact portion 182 formed on the armrest main body 132 to receive the stress.

(Position relation modification 3)
The positional relationship between the bearing 133, the receiving portion 146, and the contact portion 148 according to the present modification is set as shown in FIG. The position of the contact portion 148 is set to a position lower than the position of the shaft support means 133 and overlapping with the frame 130, and the position of the hit portion 148 is set higher than the position of the shaft support means 133 and overlap with the frame 130. May be.

  In this case, the main body member 144 is formed with a receiving rod contact portion 184 that comes into contact with the receiving rod 147 from the right side in the drawing so as to receive the stress from the receiving rod 147, for example, as illustrated. In addition, in order to avoid interference with the receiving rod 147 when the armrest main body 132 is flipped up and stored, the receiving rod 147 is positioned on the left side of the receiving rod abutting portion 184 in the drawing (that is, when the armrest main body 132 is flipped up). A cutout 186 is formed in the portion that passes. Further, if the receiving rod 147 is installed between the pair of mounting portions 138 of the armrest main body 132, the receiving rod 147 interferes with the frame 130. In this modification, the receiving rod 147 is Are protruded from the surfaces of the pair of mounting portions 138 facing each other to the extent that they do not interfere with each other.

  Further, a projection 180 is provided so as to project from a position corresponding to the contact portion 148 on the surface of the frame 130, and the receiving portion 146 of the main body member 144 is rotated counterclockwise by a receiving rod 147 as shown in the drawing. The main body member 144 is formed with a projection contact portion 182 that comes into contact with the projection 180 from the right side in the drawing so as to receive the pressing force because the pressing member 180 is pressed around. The shape of the protrusion contact portion 182 is not limited to a linear shape as shown in the figure. For example, when a hole is formed in the main body member 144 so that the protrusion 180 fits, the left circular arc portion of the hole is formed. Corresponds to the protrusion contact portion 182.

  Thus, when the armrest body 132 is in the deployed position and the user applies a stress that causes the distal end portion of the armrest body 132 to rotate further downward, the receiving rod 147 abuts on the receiving portion 146 of the main body member 144, The frame 130 receives a part of this stress via the pivoting support 133 while the frame 130 receives a part of this stress through the pivoting support 133, and a contact portion at the projection contact portion 182. 148 contacts projection 180 formed on frame 130 to receive the remaining stress.

  Also, in the case of the third modification of the positional relationship, when the main body member 144 is not provided, as shown in FIG. 42, the frame 130 receives the stress from the receiving rod 147 as shown in FIG. A receiving rod contact portion 184 that contacts the receiving rod 147 from the right side is formed. In addition, if the receiving rod 147 is installed between the pair of mounting portions 138 of the armrest main body 132, the receiving rod 147 interferes with the frame 130. In this modification, the receiving rod 147 is The pair of mounting portions 138 protrude from surfaces facing each other so as not to interfere with 130.

  Further, a projection 180 is projected from a position corresponding to the hitting portion 148 on the surface of the frame 130, and a projection contact portion 182 that contacts the projection 180 from the right side in the drawing is provided on the mounting portion 138. Is formed.

  Thereby, when the armrest main body 132 is in the deployed position and the user applies a stress for rotating the distal end portion of the armrest main body 132 further downward, the receiving rod 147 is moved to the receiving portion 146 of the receiving rod contact part 184. At the same time, the contact portion 148 in the protrusion contact portion 182 contacts the protrusion 180 formed on the frame 130 to receive the stress.

(Position relation modification example 4)
The positional relationship between the bearing means 133, the receiving part 146, and the contact part 148 according to this modification is set as shown in FIG. The position is set higher than the position of the support means 133 and on the back side of the frame 130, and the position of the hitting part 148 is higher than the position of the support means 133 and is higher than the receiving part 146. It may be set at a lower position and at a position overlapping with the frame 130.

  Further, a projection 180 is provided so as to project from a position corresponding to the contact portion 148 on the surface of the frame 130, and the receiving portion 146 of the main body member 144 is rotated counterclockwise by a receiving rod 147 as shown in the drawing. The main body member 144 is formed with a projection contact portion 182 that comes into contact with the projection 180 from the right side in the drawing so as to receive the pressing force because the pressing member 180 is pressed around. The shape of the protrusion contact portion 182 is not limited to a linear shape as shown in the figure. For example, when a hole is formed in the main body member 144 so that the protrusion 180 fits, the left circular arc portion of the hole is formed. Corresponds to the protrusion contact portion 182.

  Further, the receiving rod 147 attached to the armrest body 132 is also higher than the position of the shaft support means 133 and is disposed on the back side of the frame 130. Thus, when the armrest body 132 is in the deployed position and the user applies a stress that causes the distal end portion of the armrest body 132 to rotate further downward, the receiving rod 147 abuts on the receiving portion 146 of the main body member 144, Although it is attempted to rotate counterclockwise in the figure around the shaft support means 133, the contact portion 148 on the projection contact portion 182 abuts on the projection 180 formed on the frame 130 to receive the stress. .

  Also, in the case of the positional relationship modification example 4, when the main body member 144 is not provided, as shown in FIG. 44, the shaft support means 133 is set at a position penetrating the frame 130, and the position of the receiving portion 146 is It is higher than the position of the support means 133 and is set on the back side of the frame 130, and the position of the hitting part 148 is higher than the position of the shaft support means 133 and lower than the receiving part 146. It may be set at a position overlapping the frame 130.

  Further, a projection 180 is projected from a position corresponding to the hitting portion 148 on the surface of the frame 130, and the mounting portion 138 of the armrest main body 132 is attached to the projection contacting the projection 180 from the right side in the drawing. A contact portion 182 is formed.

  Further, the receiving rod 147 attached to the armrest body 132 is also higher than the position of the shaft support means 133 and is disposed on the back side of the frame 130. Thus, when the armrest main body 132 is in the deployed position and the user applies a stress that causes the distal end portion of the armrest main body 132 to rotate further downward, the receiving rod 147 contacts the receiving portion 146 on the surface of the frame 130. At the same time, the contact portion 148 of the protrusion contact portion 182 contacts the protrusion 180 formed on the frame 130 to receive the stress.

  In the above positional relationship modification, the pivot support means 133 is set at a position penetrating the frame 130. In the following positional relationship modification, the pivot support means 133 is located on the front side or the rear side of the frame 130. Will be described. As means for disposing (indirectly fixing) the shaft support means 133 on the front side or the rear side of the frame 130 in this manner, welding or bonding the shaft support means 133 to the surface of the frame 130, or Means for projecting the bracket 190 from above and fixing the pivot support means 133 to the bracket 190 can be considered. In particular, by making the “third member” itself such as the bracket 190 detachable from the frame 130, a projection or the like does not undesirably remain on the frame 130 after the armrest 24 is removed. Therefore, the folding chair 10 without the armrest 24 can be used without discomfort in a state where the entire armrest 24 is removed.

(Position relation modification example 5)
As shown in FIG. 45, the positional relationship between the bearing 133, the receiving portion 146, and the contact portion 148 according to the present modification is, for example, the position of the bearing 133 on the rear side of the frame 130 using a bracket (not shown). May be set, and the positions of the receiving portion 146 and the contact portion 148 may be set lower than the position of the shaft support means 133, which is basically the same as each other, and on the front side of the frame 130.

  In this case, the receiving rod 147 attached to the armrest main body 132 is also lower than the position of the pivot support means 133 and is disposed on the front side of the frame 130. Thus, when the armrest body 132 is in the deployed position and the user applies a stress that causes the distal end portion of the armrest body 132 to rotate further downward, the receiving rod 147 abuts on the receiving portion 146 of the main body member 144, Basically, the hit portion 148 at the same position comes into contact with the frame 130 to receive the stress.

  Also, in the case of the positional relationship modification example 5, when the main body member 144 is not provided, as shown in FIG. 46, a bracket 190 capable of setting the position of the pivot support means 133 is provided on the back side of the frame 130, and The positions of the 146 and the contact portion 148 may be set lower than the position of the shaft support means 133, which is the same position as each other, and on the front side of the frame 130.

  In this case, the receiving rod 147 attached between the pair of attachment portions 138 of the armrest main body 132 is also lower than the position of the pivot support means 133 when the armrest main body 132 is in the deployed position, and on the front side of the frame 130. Are located. Thus, when the armrest main body 132 is in the deployed position and the user applies a stress to rotate the distal end portion of the armrest main body 132 further downward, the receiving rod 147 comes into contact with the receiving portion 146 of the frame 130, and The hit location 148 at the same location in 130 receives the stress.

(Position relation modification 6)
As shown in FIG. 47, the positional relationship between the bearing 133, the receiving portion 146, and the contact portion 148 according to the present modified example is shown by using a bracket (not shown) on the rear side of the frame 130. Is set, the position of the receiving portion 146 is set lower than the position of the shaft support means 133 and on the front side of the frame 130, and the position of the hitting portion 148 is set lower than the position of the shaft support means 133. And may be set at a position overlapping the frame 130.

  In this case, a projection 180 is protruded from a position corresponding to the hitting portion 148 on the surface of the frame 130, and the receiving portion 146 of the main body member 144 is pressed counterclockwise in FIG. Therefore, the main body member 144 is formed with a projection contact portion 182 that contacts the projection 180 from the left side in the figure so as to receive this pressing force, as shown in the figure, for example. The shape of the protrusion contact portion 182 is not limited to a linear shape as shown in the figure. For example, when a hole is formed in the main body member 144 so that the protrusion 180 fits, the left circular arc portion of the hole is formed. Corresponds to the protrusion contact portion 182.

  Thus, when the armrest body 132 is in the deployed position and the user applies a stress that causes the distal end portion of the armrest body 132 to rotate further downward, the receiving rod 147 abuts on the receiving portion 146 of the main body member 144, Although the rotation is to be made counterclockwise in the figure around the pivot support means 133, the contact portion 148 of the projection contact portion 182 contacts the projection 180 formed on the frame 130 to receive the stress. .

  Also in the case of the positional relationship modification example 6, when the main body member 144 is not provided, as shown in FIG. 48, a bracket 190 capable of setting the position of the pivot support means 133 is provided on the back side of the frame 130, and the receiving portion is provided. The position of 146 is set lower than the position of the shaft support means 133 and on the front side of the frame 130, and the position of the contact portion 148 is lower than the position of the shaft support means 133, and They may be set at overlapping positions.

  In this case, a projection 180 is projected from a position corresponding to the contact portion 148 on the surface of the frame 130, and the armrest body 132 has a projection contact portion 182 that contacts the projection 180 from the left side in the figure. Are formed.

  Thereby, when the armrest main body 132 is in the deployed position and the user applies a stress for rotating the distal end portion of the armrest main body 132 further downward, the receiving rod 147 comes into contact with the receiving portion 146 of the frame 130, and The contact portion 148 of the protrusion contact portion 182 contacts the protrusion 180 formed on the frame 130 to receive the stress.

(Position relation modification 7)
As shown in FIG. 49, the positional relationship between the bearing 133, the receiving portion 146, and the hitting portion 148 according to the present modification is, for example, the position of the bearing 133 on the front side of the frame 130 using a bracket (not shown). Is set, the position of the receiving portion 146 is set lower than the position of the shaft support means 133 and the front side of the frame 130, and the position of the hitting portion 148 is set higher than the position of the shaft support means 133. And on the back side of the frame 130.

  Thus, when the armrest body 132 is in the deployed position and the user applies a stress that causes the distal end portion of the armrest body 132 to rotate further downward, the receiving rod 147 abuts on the receiving portion 146 of the main body member 144, In this case, the frame 130 receives a part of this stress via the shaft support 133 while the contact portion 148 contacts the frame 130. The remaining stress is received.

  Also in the case of the positional relationship modification example 7, when the main body member 144 is not provided, as shown in FIG. 50, a bracket 190 capable of setting the position of the shaft support means 133 is provided on the front side of the frame 130, and the receiving portion is provided. The position of 146 may be set lower than the position of the pivot support 133 and on the front side of the frame 130, and the position of the hitting portion 148 may be set at the same position as the receiving portion 146.

  Thus, when the armrest body 132 is in the deployed position and the user applies a stress that causes the distal end portion of the armrest body 132 to rotate further downward, the receiving rod 147 comes into contact with the receiving portion 146 on the surface of the frame 130. At the same time, the hit portion 148 at the same position in the frame 130 receives the stress.

(Position relation modification 8)
As shown in FIG. 51, the positional relationship between the bearing 133, the receiving portion 146, and the hitting portion 148 according to this modification is determined by, for example, using a bracket (not shown) on the front side of the frame 130. May be set, and the position of the receiving part 146 and the position of the contact part 148 may be set higher than the position of the shaft support means 133, which is the same position as each other, and on the back side of the frame 130.

  In this case, the receiving rod 147 attached to the armrest main body 132 is also higher than the position of the pivot support means 133 and is disposed on the back side of the frame 130 when the armrest main body 132 is in the deployed position. Thus, when the armrest body 132 is in the deployed position, when the user applies a stress that causes the distal end portion of the armrest body 132 to rotate further downward, the receiving rod 147 comes into contact with the receiving portion 146 of the main body member 144. The stress is received by the hit portion 148 at the same position.

  Also in the case of the positional relationship modification example 8, when the main body member 144 is not provided, as shown in FIG. 52, a bracket 190 capable of setting the position of the shaft support means 133 is provided on the front side of the frame 130, and the receiving portion is provided. The position of 146 and the position of the contact portion 148 may be set higher than the position of the shaft support means 133, which is the same position, and on the rear side of the frame 130.

  The receiving rod 147 attached to the armrest main body 132 is also higher than the position of the pivot support means 133 and is disposed on the back side of the frame 130 when the armrest main body 132 is in the deployed position. Thus, when the armrest body 132 is in the deployed position, when the user applies a stress that causes the distal end portion of the armrest body 132 to rotate further downward, the receiving rod 147 contacts the receiving portion 146 on the surface of the frame 130. The stress is received by the contact portion 148 that is in contact with and located at the same position.

(Position relation modification 9)
As shown in FIG. 53, the positional relationship between the bearing 133, the receiving portion 146, and the hitting portion 148 according to the present modified example is shown in FIG. Is set, the position of the receiving part 146 is set higher than the position of the shaft support means 133 and on the back side of the frame 130, and the position of the contact part 148 is set higher than the position of the shaft support means 133. In addition, it may be set at a position lower than the receiving portion 146 and further overlapping the frame 130.

  In this case, a projection 180 is protruded from a position corresponding to the hitting portion 148 on the surface of the frame 130, and the receiving portion 146 of the main body member 144 is inverted by a receiving rod 147 as shown in the drawing. Since the main body member 144 is pressed clockwise, the main body member 144 is formed with a protrusion contact portion 182 that contacts the protrusion 180 from the right side in the drawing so as to receive the pressing force. Note that the shape of the protrusion contact portion 182 is not limited to a linear shape as shown in the figure. For example, when a hole is formed in the main body member 144 so that the protrusion 180 fits, the right circular arc portion of the hole may be used. Corresponds to the protrusion contact portion 182.

  Thus, when the armrest body 132 is in the deployed position and the user applies a stress that causes the distal end portion of the armrest body 132 to rotate further downward, the receiving rod 147 abuts on the receiving portion 146 of the main body member 144, When the main body member 144 is rotated counterclockwise in the figure around the pivot support means 133, the projection contact portion 182 contacts the projection 180 formed on the frame 130 to receive the stress. .

  In the case of the positional relationship modification example 9 as well, when the main body member 144 is not provided, a bracket 190 capable of setting the position of the pivot support means 133 is provided on the front side of the frame 130 as shown in FIG. The position of 146 is set higher than the position of the support means 133 and on the back side of the frame 130, and the position of the hitting part 148 is higher than the position of the support means 133 and the receiving part 146. Lower, and may be set at a position overlapping the frame 130.

  Further, a projection 180 is projected from a position corresponding to the contact portion 148 on the surface of the frame 130, and a pair of mounting portions 138 of the armrest main body 132 are provided with projections that come into contact with the projection 180 from the right side in the drawing. A part contact part 182 is formed.

  Thereby, when the armrest main body 132 is in the deployed position and the user applies a stress for rotating the distal end portion of the armrest main body 132 further downward, the receiving rod 147 comes into contact with the receiving portion 146 of the frame 130, and The projection contact portion 182 contacts the projection 180 formed on the frame 130 to receive the stress.

(Other Modifications Related to Armrest 24)
Throughout the entire variation of the structure of the armrest 24 described so far, the shaft support means 133 may be set to a length that penetrates the frame 130, or alternatively, the length of the shaft support means 133 may be set to be short. Then, the portion corresponding to the center of the cross section of the frame 130 may be in a state where the shaft support means 133 are not connected to each other.

  Similarly, the receiving rod 147 may be set to a length equal to or larger than the diameter of the frame 130 except for a case where the receiving portion 146 overlaps the frame 130. Alternatively, the length may be set shorter. The receiving rods 147 may not be connected to each other at a portion corresponding to the center of the cross section of the frame 130.

  Further, the number of the shaft support means insertion holes 142 formed in the frame 130 is not limited to one, and a plurality of shaft support means insertion holes 142 may be formed in the vertical direction of the frame 130. By forming a plurality of shaft support means insertion holes 142 in the vertical direction of the frame 130 in this way, it is possible to select which shaft support means insertion hole 142 the shaft support means 133 is to be inserted into, and to select the height direction of the armrest 24. It is preferable in that the position can be adjusted.

  Further, in the above-described embodiment, the armrest main body 132 is attached to the frame 130 extending above the seat 16 of the front leg 12, but instead of this, the armrest main body 132 is above the seat 16 from the rear leg 14. The frame 130 may be extended, and the armrest body 132 may be attached to the frame 130 from the rear leg 14.

  The embodiments disclosed this time are to be considered in all respects as illustrative and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

DESCRIPTION OF SYMBOLS 10 ... Folding chair (chair), 12 ... Front leg, 14 ... Rear leg, 16 ... Seat, 18 ... Link connection bar, 20 ... Link bar, 21 ... Reinforcement bar, 22 ... Backrest, 24 ... Armrest, 26 ... Backrest support Part, 28 ... horizontal part, 30 ... front leg part, 32 ... leg rubber (of front leg 12), 34 ... backrest mounting part, 36 ... outer pipe (of front leg 12), 38 ... height adjustment hole (of front leg 12), 40 ... inner pipe (of front leg 12), 42 ... height adjustment pin (of front leg 12), 44 ... seat support, 46 ... rear leg, 48 ... leg rubber (of rear leg 14), 50 ... (rear) Outer pipe (of the leg 14), 52... Height adjustment hole (of the rear leg 14), 54... Inner pipe (of the rear leg 14), 56... Height adjustment pin (of the rear leg 14), 58. Hole, 60: rear leg side shaft support hole, 62: shaft support pin, 63: front leg support portion, 64: seat shaft support pin, 65: front leg Holding member, 66: seat shaft support hole, 68: seat shaft support pin hole, 70: stopper, 72: engagement claw, 74: support protrusion, 76: fitting groove, 78: bracket, 79: shaft attachment Pin, 80: Bracket plate material, 81: Shaft pin insertion hole, 82: End, 84: Center, 86: Link bar body member, 88: Link connection bar holding member, 90: Recess, 92: Recess , 94: screw, 96: shaft mounting pin insertion hole, 98: armrest mounting portion, 100: front leg side shaft support hole, 102: seat support bar, 104: projecting portion, 106: projecting portion 110: rotational biasing Reference numerals 112, coil portion, 114, first arm portion, 116, second arm portion 120, fixing hole, 122, arm portion locking pin 130, frame (of front leg 12), 132, armrest body, 133, pivot Means, 134: rotation restricting means, 138: mounting part, 140: pivot Step insertion hole, 141: second hole of shaft support means insertion, 142: shaft support means insertion hole, 144: body member, 145: body member piece, 146: receiving part, 147 ... receiving rod, 148 ... contact part, 150 ... Cover 160: disk-shaped member, 162: shaft member, 164: knob, 166: disk-shaped member, 168: shaft member, 172: shaft pressing member, 174: shaft pressing member biasing member, 176: shaft member insertion hole, 180: Projecting portion, 182: Projecting portion contact portion, 184: Receiving rod contact portion, 186: Notch, 190: Bracket

Claims (7)

A pair of front legs, a pair of rear legs pivotally supported on the front legs, respectively, and a seat rotatable with respect to the front legs and the rear legs between a horizontal state and a flipped state; And a folding chair comprising:
The rear leg is disposed inside the front leg,
The seat is rotatably supported on the support leg using one of the front leg and the rear leg as a support leg.
A link connection bar erected between the link legs with the other of the front legs and the rear legs not being the support leg being a link leg;
A link bar having one end rotatably connected to the link connection bar and the other end rotatably connected to the bottom surface of the seat;
A folding chair, wherein a stopper is provided on a bottom surface of the seat to engage with the link connection bar when the seat is in a horizontal state.   The folding chair according to claim 1, wherein the pivot leg is the rear leg, and the link leg is the front leg.   The position at which the rear leg is pivotally supported with respect to the front leg is located forward of a position at which the seat portion is pivotally supported with respect to the pivot leg. Folding chair.   The folding chair according to any one of claims 1 to 3, further comprising a rotation urging member that acts on a bottom surface of the seat to rotate the seat upward. An armrest body having one end attached to a frame extending above the seat from the front leg or the rear leg,
Pivotally supporting means for rotatably mounting the armrest body to the frame,
The folding chair according to claim 1, wherein the pivoting means can remove the armrest body from the frame without tools. An armrest body having one end attached to a frame extending above the seat from the front leg or the rear leg,
A rotation restricting member for restricting a rotation range of the armrest main body with respect to the frame is further provided.
The rotation restricting member has a receiving portion that directly receives a force in a direction of rotating the other end of the armrest body downward, and a hit portion that receives the force in cooperation with the frame. The folding chair according to claim 1. 7. The folding chair according to claim 6, further comprising pivotally supporting means for rotatably mounting the armrest body to the frame and receiving a part of the force.

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